Fraud of my friends company name and created a website pretending to be them

Someone has registered a .co.uk address of my friends UK limited company and is now hosting a website pretending to be them.

This has strangely occurred at the same time a number of fraudulent requests for 3G mobile internet contracts and other items have been raised against the company.

I would like to know what can be done to help him remove these offending articles.

The website is being hosted through 1and1.co.uk, and the website is registered through nominet.